Аннотация:We report on calculation of classical ultrarelativistic
gravitational bremsstrahlung in particle collisions in the ADD
model with d toroidal extra dimensions using post-linear
approximation. The radiation efficiency obtained can be expressed in terms of the
Schwarzschild radius, corresponding to the collision energy, the impact parameter and the center-of-mass Lorentz factor. This is larger than previously known
estimates and is interpreted as indication on string radiative
damping of transplanckian collisions.